two harmful and two useful changes
Answers
Useful changes refer to beneficial changes made by us to activities we do in our daily life. Some of them are
*Turning off electric/electronic appliances when not in use
*Turning off the engine of the vehicle while waiting at a traffic signal
*Recycling old newspapers by converting them into carry bags
*Stop using plastic and similar harmful substances that cause environmental degradation
*Carpooling to your workplace with colleagues who stay in the same locality as you so that you can save fuel
*Cooking on a low flame instead of high flame
*Ensuring that the water taps are closed properly after use
*Using organic compost as manure for the garden instead of chemicals
*Replacing ordinary light bulbs with their compact fluorescent counterparts to save energy
*Maintaining an optimum speed when driving the car instead of going at a very high speed